RF output DOES NOT equal Composite!!!!

From: Dave Woodman <dave_at_naffnet.org.uk>
Date: Sun Jun 16 16:28:49 2002

John Honniball wrote:

> Dave Woodman wrote:
> > The mechanism that was used in early TV sets to achieve the
> > correction was rather interesting:- the set contained a glass block,
> > with an ultrasonic transducer at each end (one sending, the other?
> > well, no prizes for guessing!). The delay in the block was one
> > transmitted line so the output could be directly compared with the
> > following line. Ah, the wonders of old technology...
>
> Old technology? Does that mean there's some newer version of
> the standard PAL delay line that I wasn't previously aware of?
>
> I thought all PAL sets (and video recorders?) used a glass delay
> line in this manner.

Perchance they do - the technology is still old, though! I haven't
played games with TV internals for many a long year - and when
I was playing I didn't like the HT finding me to be a convenient
ground, when I thought I have discharged all the caps - I still have
the odd tiny scar from the arcs...

I do know that some use a chip to perform the delay - what the
mechanism inside the chip is, I don't know (perhaps old
technology in a new package?).

    Cheers,

            Dave.
Received on Sun Jun 16 2002 - 16:28:49 BST